542933-UIM-C-0112
Johnson Controls Unitary Products 27
If the outdoor temperature is above the balance point temperature setting, the auxiliary heat will not
be used to satisfy the heating demand *.
If the outdoor temperature is below the LTCO, the heat pump will not be used to satisfy the heating
demand.
If the outdoor temperature is between both the balance point and the LTCO temperature settings,
the thermostat will stage both heat pump and auxiliary heat as demand increases.
*If after 4 hours the heating demand is not satisfied, auxiliary heat will be supplied. Reference
communicating heat pump literature for more detail on heat pump operation.
Airflow Configuration
The airflow configuration screens are available on systems that contain a communicating ID unit.
Here the user can change delay profiles and airflow settings. CFM settings and ranges are defined
by factory programmed values in the outdoor and indoor controls.
Delay profile:
The delay profile is an airflow profile that the system will run in COOL mode. These profiles are not
implemented in heating. Each profile is designed to accommodate the original environment where
the equipment is installed.
Compressor Delay: (ON, OFF) Compressor
Delay will turn the compressor off for 30 seconds
immediately after energizing the reversing valve
(in defrost). The purpose is to reduce noise in
defrost.
Defrost Curve: (1-6) Defrost Curve is set in the
factory and should only be changed in a repair
part installation
Switch Point: (35, 40, 45) Switch Point is the temperature of the liquid line sensor (in Fahrenheit) at
which the heat pump will force 2
nd
stage operation.
Y2 Lock: (ON, OFF) Y2 Lock allows the Heat pump control to anticipate 2
nd
stage operation.
Balance Point and Low Temperature Cut Out (LTCO): Balance Point and LTCO settings deter-
mine how heating calls will be satisfied by the system.
Changing airflow settings can effect system efficiency. Reference outdoor equipment tech guide
for more information on system efficiencies.
To change the delay profiles press the box next to
the profile that is desired (as pictured). Each of
the profiles, (when selected) will provide a brief
description of the profile design intent.
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